Vacuum cleaner



FIG. 1 is a perspective view of a vacuum cleaner showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof; and,

FIG. 6 is a top plan view thereof. 

We claim the ornamental design for a vacuum cleaner, as shown. 